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- Andersson, Georg, et al.
(author)
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Time lags in biodiversity response to farming practice
- 2010
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In: Aspects of Applied Biology. - 0265-1491. ; 100, s. 381-384
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Journal article (other academic/artistic)abstract
- Agri-environmental schemes have been applied with the goal to mitigate negative effects of agriculture on biodiversity and ecosystem functioning. However, on evaluating the schemes the results have been variable and shown both positive and neutral effects. These variable effects can be attributed to not taking into account important factors affecting the variables at test, such as biodiversity. These factors include no exact definition of the farming practice, landscape complexity and the scale of study. Here we introduce a fourth factor not considered, the time scale of study. The implications and effects are discussed shortly.
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- Bergkvist, Göran, et al.
(author)
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Long-term field experiments in Sweden – what are they designed to study and what could they be used for?
- 2011
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In: Aspects of Applied Biology. - 0265-1491. ; 113, s. 75-85
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Conference paper (other academic/artistic)abstract
- Long-term field experiments (LTEs) have proven a useful resource when assessing the impact of different management practices on soil, water and production. Departments at the Faculty of Natural Resources and Agricultural Sciences at the Swedish University of Agricultural Sciences run more than forty long-term field experiments. The oldest LTEs typically investigate the effect of cropping systems, crop rotations and fertiliser regimes on yield and soil fertility. More recent experiments concentrate on making efficient use of soil resources and on environmental effects of crop production and different management practices. In 2007 a Management Board was formed to encourage Departments to re-evaluate their existing LTEs and even start new field experiments that are destined to become long-term. The new LTEs should serve as research platforms and be useful for several disciplines. In this paper we reflect on the present LTEs and discuss how useful they are, and the need for new LTEs
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- Bergkvist, Göran, et al.
(author)
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Nitrogen fertiliser dose influence the effect of two year rotational leys with grass or clover- grass on other crops in the rotation
- 2015
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In: Aspects of Applied Biology. - 0265-1491. ; 128, s. 133-139
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Conference paper (other academic/artistic)abstract
- Rotational leys increase yields of subsequent crops. The investigation of long term effects of repeated use of rotational leys in long-term field experiments (LTEs) is often confounded with the effects of animal manure. We used three LTEs situated in southern Sweden to investigate the importance of rotational leys, ley composition and fertiliser regime on grain yield of oats grown as the third crop after incorporation of the leys. We found that 2-year clover/grass and grass leys in 6 year rotations increased yield of oats. At low N regimes, clover/grass leys increase yields more than pure grass leys, but they have similar effect on oats yield when both the grass ley and the oats is fertilised with high doses of N fertiliser. The positive effect of leys on oats yields does not increase continuously over time.
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- Bergkvist, Göran, et al.
(author)
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The design of a new cropping system experiment to be used as a research platform – maize and winter wheat in monoculture and rotations
- 2011
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In: Aspects of Applied Biology. - 0265-1491. ; 113, s. 61-66
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Conference paper (other academic/artistic)abstract
- According to climate models, the winters in large parts of Sweden will become milder and precipitation will increase. At the same time natural resources can be expected to become more scarce and expensive. To address questions associated with these changing conditions we have started a long-term field experiment that has some special features, such as involvement from many disciplines, four true replicates, all crops each year by considering crops as study crops or break crops (2-year rotation, study crop – break crop) and large plots that allow both monitoring from satellites and strips at each side of the harvest plot for short term experiments. In this paper we present the experiment, with special emphasis on the novelty in the design. We believe that its features will make the experiment a platform for collaboration between researchers within and outside The Swedish University of Agricultural Sciences (SLU)
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- Dhamala, Nawa Raj, et al.
(author)
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Intercropping of oat and pea to address field-scale soil heterogeneity
- 2021
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In: Aspects of Applied Biology. - 0265-1491. ; 146, s. 275-280
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Conference paper (other academic/artistic)abstract
- Growing grain legumes is challenging due to a high spatial and temporal variability in yield caused by various biotic and abiotic factors, which may be compensated and/or minimised by intercropping (IC) with cereals. However, little is known about the effect of field-scale soil spatial variability on competitive interactions between the IC components, resource use and crop yield performance. A field experiment was conducted to determine how intercropping (IC) of oat (Avena sativa L.) and field pea (Pisum sativum L.) affects crop yield, and balances the field-scale heterogeneity in soil conditions compared to sole crops (SCs). The soil parameters and crop yields varied considerably across the field. The oat-pea IC showed less field-scale variability in yield and suppressed weeds more strongly than pea SC. The study will provide an important insight into how IC can address the issue of crop yield variability and weed growth arising from the variable soil conditions.
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